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257 or 270 weatherby
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<blockquote data-quote="Trickymissfit" data-source="post: 919869" data-attributes="member: 25383"><p>A good .257 bullet weighing 120 grains will have a B/C of about .40 (most won't). Whether you can get 3400fps with that bullet is something I've never seen. But have seen 3280fps with a 26" barrel. At 3300fps and a .40 B/C you are looking at about 1300ft.lb. of energy at 500 yards. The 270 mag is not at it's best with a 130 grain bullet. It wants a 150 to 160 grain bullet. The Hornaday IB has a B/C of .52, and will do an honest 3100fps. That calculates to over 1600ft.lb. of energy at 500 yards. (AA 3100 powder will push that 150 grain bullet 3200fps).</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 919869, member: 25383"] A good .257 bullet weighing 120 grains will have a B/C of about .40 (most won't). Whether you can get 3400fps with that bullet is something I've never seen. But have seen 3280fps with a 26" barrel. At 3300fps and a .40 B/C you are looking at about 1300ft.lb. of energy at 500 yards. The 270 mag is not at it's best with a 130 grain bullet. It wants a 150 to 160 grain bullet. The Hornaday IB has a B/C of .52, and will do an honest 3100fps. That calculates to over 1600ft.lb. of energy at 500 yards. (AA 3100 powder will push that 150 grain bullet 3200fps). gary [/QUOTE]
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257 or 270 weatherby
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